CVE-2011-2515 in PackageKit
Summary
by MITRE
PackageKit 0.6.17 allows installation of unsigned RPM packages as though they were signed which may allow installation of non-trusted packages and execution of arbitrary code.
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Analysis
by VulDB Data Team • 02/28/2024
PackageKit version 0.6.17 contains a critical security vulnerability that undermines the integrity verification mechanisms designed to protect against unauthorized package installations. This flaw resides in the package management system's handling of RPM packages, specifically allowing unsigned packages to be installed with the same trust level as properly signed packages. The vulnerability stems from insufficient validation of package signatures during the installation process, creating a pathway for malicious actors to exploit the system's trust model. This issue directly relates to CWE-330, which addresses the use of insecure random number generators, and more specifically to CWE-310, concerning cryptographic issues that weaken security protocols.
The technical implementation of this vulnerability allows attackers to bypass the standard package verification procedures that are typically enforced by package managers. When PackageKit processes RPM packages, it fails to properly validate the cryptographic signatures that should confirm package authenticity and integrity. This allows unsigned packages to be treated as legitimate installations, effectively undermining the security controls that prevent unauthorized code execution. The flaw operates at the package management layer where trust decisions are made, creating a persistent vulnerability that can be exploited across various Linux distributions that utilize PackageKit for package handling.
The operational impact of CVE-2011-2515 extends beyond simple package installation, as it creates opportunities for privilege escalation and arbitrary code execution. An attacker who can manipulate package installation processes can install malicious software that appears to be legitimate system components, potentially gaining elevated privileges or establishing persistent access. This vulnerability aligns with ATT&CK technique T1059, which covers command and script interpreter execution, and T1068, concerning exploit for privilege escalation. The flaw can be particularly dangerous in enterprise environments where automated package management systems might be used to deploy updates, as it allows for the injection of malicious code into otherwise trusted deployment pipelines.
Mitigation strategies for this vulnerability should focus on immediate package updates to versions that address the signature validation issue, as well as implementing additional verification measures such as manual signature checks before package installation. System administrators should also consider implementing package integrity monitoring solutions and establishing strict policies around package source verification. The fix typically involves strengthening the signature validation logic within PackageKit to ensure that unsigned packages are properly rejected or flagged for manual verification before installation. Organizations should also review their package management workflows to ensure that only trusted sources are used for package distribution, and implement network-level controls to prevent unauthorized package downloads. This vulnerability demonstrates the critical importance of maintaining proper cryptographic verification in system package management, as it directly impacts the overall security posture of Linux-based systems.